Imperial State Crown weighs 91 kilograms. Due to the weight of the crown, it is often worn on and off for a few hours before the State Opening of Parliament, to get the wearer used to the weight. Queen Elizabeth II has been known to eat her breakfast and read the morning papers wearing it.
The Imperial State Crown, or Crown of State, is formed from an openwork gold frame, mounted with three very large stones, and set with 2868 diamonds in silver mounts, largely table-, rose- and brilliant-cut, and colored stones in gold mounts, including 17 sapphires, 11 emeralds and 269 pearls. | Royal Collection Trust
The British Imperial State Crown is the most magnificent of all the Crown Regalia. It was made in 1838 for the coronation of Queen Victoria, and then altered for the coronation of George VI in 1937 and Elizabeth II in 1953. It replaced the crown of St. Edward on the head of the ruler immediately after the coronation. Although the crown is modern in design it is set with very ancient gems.
The Imperial State Crown (1937) is worn by the Queen at each State Opening of Parliament. One of the youngest crowns in the collection, it holds a number of much older gems. The crown was remade in 1937 after the previous frame weakened under the weight of the gemstones.
The Imperial State Crown, the most famous of the United Kingdom Crown Jewels, was re-made in 1937 for the coronation of King George IV, father of Queen Elizabeth II. It is set with over 3000 gems transferred from the old Imperial Crown, which itself had been remade several times since the 17th century.
Imperial State Crown: Worn by the Queen at the State Opening of Parliament, it is set with the Second Star of Africa, a 317-carat dazzler which was one of nine off-cuts from the Cullinan Diamond - the largest ever found - presented to Edward VII in 1907.
The Stewart Sapphire, which had been owned by the Royal House of Scotland for centuries, was also given to George III. The original owner of the sapphire was reputed to have been King Alexander II of Scotland, who had it set into his crown for his coronation in 1214. Edward I of England took the sapphire along with the Stone of Scone in 1296, during his invasion of Scotland. His grandson, King Edward III, later returned the jewel to his brother-in-law David II of Scotland.